1/***************************************************************************
2 *                                  _   _ ____  _
3 *  Project                     ___| | | |  _ \| |
4 *                             / __| | | | |_) | |
5 *                            | (__| |_| |  _ <| |___
6 *                             \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at http://curl.haxx.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 ***************************************************************************/
22#include "setup.h"
23
24#include <curl/curl.h>
25
26#define ENABLE_CURLX_PRINTF
27/* use our own printf() functions */
28#include "curlx.h"
29
30#include "tool_cfgable.h"
31#include "tool_getparam.h"
32#include "tool_helpers.h"
33#include "tool_homedir.h"
34#include "tool_msgs.h"
35#include "tool_parsecfg.h"
36
37#include "memdebug.h" /* keep this as LAST include */
38
39#define CURLRC DOT_CHAR "curlrc"
40#define ISSEP(x) (((x) == '=') || ((x) == ':'))
41
42static const char *unslashquote(const char *line, char *param);
43static char *my_get_line(FILE *fp);
44
45/* return 0 on everything-is-fine, and non-zero otherwise */
46int parseconfig(const char *filename,
47                struct Configurable *config)
48{
49  int res;
50  FILE *file;
51  char filebuffer[512];
52  bool usedarg;
53  char *home;
54  int rc = 0;
55
56  if(!filename || !*filename) {
57    /* NULL or no file name attempts to load .curlrc from the homedir! */
58
59#ifndef __AMIGA__
60    filename = CURLRC;   /* sensible default */
61    home = homedir();    /* portable homedir finder */
62    if(home) {
63      if(strlen(home) < (sizeof(filebuffer) - strlen(CURLRC))) {
64        snprintf(filebuffer, sizeof(filebuffer),
65                 "%s%s%s", home, DIR_CHAR, CURLRC);
66
67#ifdef WIN32
68        /* Check if the file exists - if not, try CURLRC in the same
69         * directory as our executable
70         */
71        file = fopen(filebuffer, "r");
72        if(file != NULL) {
73          fclose(file);
74          filename = filebuffer;
75        }
76        else {
77          /* Get the filename of our executable. GetModuleFileName is
78           * already declared via inclusions done in setup header file.
79           * We assume that we are using the ASCII version here.
80           */
81          int n = GetModuleFileName(0, filebuffer, sizeof(filebuffer));
82          if(n > 0 && n < (int)sizeof(filebuffer)) {
83            /* We got a valid filename - get the directory part */
84            char *lastdirchar = strrchr(filebuffer, '\\');
85            if(lastdirchar) {
86              size_t remaining;
87              *lastdirchar = 0;
88              /* If we have enough space, build the RC filename */
89              remaining = sizeof(filebuffer) - strlen(filebuffer);
90              if(strlen(CURLRC) < remaining - 1) {
91                snprintf(lastdirchar, remaining,
92                         "%s%s", DIR_CHAR, CURLRC);
93                /* Don't bother checking if it exists - we do
94                 * that later
95                 */
96                filename = filebuffer;
97              }
98            }
99          }
100        }
101#else /* WIN32 */
102        filename = filebuffer;
103#endif /* WIN32 */
104      }
105      Curl_safefree(home); /* we've used it, now free it */
106    }
107
108# else /* __AMIGA__ */
109    /* On AmigaOS all the config files are into env:
110     */
111    filename = "ENV:" CURLRC;
112
113#endif
114  }
115
116  if(strcmp(filename,"-"))
117    file = fopen(filename, "r");
118  else
119    file = stdin;
120
121  if(file) {
122    char *line;
123    char *aline;
124    char *option;
125    char *param;
126    int lineno = 0;
127    bool alloced_param;
128
129    while(NULL != (aline = my_get_line(file))) {
130      lineno++;
131      line = aline;
132      alloced_param=FALSE;
133
134      /* line with # in the first non-blank column is a comment! */
135      while(*line && ISSPACE(*line))
136        line++;
137
138      switch(*line) {
139      case '#':
140      case '/':
141      case '\r':
142      case '\n':
143      case '*':
144      case '\0':
145        Curl_safefree(aline);
146        continue;
147      }
148
149      /* the option keywords starts here */
150      option = line;
151      while(*line && !ISSPACE(*line) && !ISSEP(*line))
152        line++;
153      /* ... and has ended here */
154
155      if(*line)
156        *line++ = '\0'; /* zero terminate, we have a local copy of the data */
157
158#ifdef DEBUG_CONFIG
159      fprintf(stderr, "GOT: %s\n", option);
160#endif
161
162      /* pass spaces and separator(s) */
163      while(*line && (ISSPACE(*line) || ISSEP(*line)))
164        line++;
165
166      /* the parameter starts here (unless quoted) */
167      if(*line == '\"') {
168        /* quoted parameter, do the quote dance */
169        line++;
170        param = malloc(strlen(line) + 1); /* parameter */
171        if(!param) {
172          /* out of memory */
173          Curl_safefree(aline);
174          rc = 1;
175          break;
176        }
177        alloced_param = TRUE;
178        (void)unslashquote(line, param);
179      }
180      else {
181        param = line; /* parameter starts here */
182        while(*line && !ISSPACE(*line))
183          line++;
184        *line = '\0'; /* zero terminate */
185      }
186
187      if(param && !*param) {
188        /* do this so getparameter can check for required parameters.
189           Otherwise it always thinks there's a parameter. */
190        if(alloced_param)
191          Curl_safefree(param);
192        param = NULL;
193      }
194
195#ifdef DEBUG_CONFIG
196      fprintf(stderr, "PARAM: \"%s\"\n",(param ? param : "(null)"));
197#endif
198      res = getparameter(option, param, &usedarg, config);
199
200      if(param && *param && !usedarg)
201        /* we passed in a parameter that wasn't used! */
202        res = PARAM_GOT_EXTRA_PARAMETER;
203
204      if(res != PARAM_OK) {
205        /* the help request isn't really an error */
206        if(!strcmp(filename, "-")) {
207          filename = (char *)"<stdin>";
208        }
209        if(PARAM_HELP_REQUESTED != res) {
210          const char *reason = param2text(res);
211          warnf(config, "%s:%d: warning: '%s' %s\n",
212                filename, lineno, option, reason);
213        }
214      }
215
216      if(alloced_param)
217        Curl_safefree(param);
218
219      Curl_safefree(aline);
220    }
221    if(file != stdin)
222      fclose(file);
223  }
224  else
225    rc = 1; /* couldn't open the file */
226
227  return rc;
228}
229
230/*
231 * Copies the string from line to the buffer at param, unquoting
232 * backslash-quoted characters and NUL-terminating the output string.
233 * Stops at the first non-backslash-quoted double quote character or the
234 * end of the input string. param must be at least as long as the input
235 * string.  Returns the pointer after the last handled input character.
236 */
237static const char *unslashquote(const char *line, char *param)
238{
239  while(*line && (*line != '\"')) {
240    if(*line == '\\') {
241      char out;
242      line++;
243
244      /* default is to output the letter after the backslash */
245      switch(out = *line) {
246      case '\0':
247        continue; /* this'll break out of the loop */
248      case 't':
249        out = '\t';
250        break;
251      case 'n':
252        out = '\n';
253        break;
254      case 'r':
255        out = '\r';
256        break;
257      case 'v':
258        out = '\v';
259        break;
260      }
261      *param++ = out;
262      line++;
263    }
264    else
265      *param++ = *line++;
266  }
267  *param = '\0'; /* always zero terminate */
268  return line;
269}
270
271/*
272 * Reads a line from the given file, ensuring is NUL terminated.
273 * The pointer must be freed by the caller.
274 * NULL is returned on an out of memory condition.
275 */
276static char *my_get_line(FILE *fp)
277{
278  char buf[4096];
279  char *nl = NULL;
280  char *retval = NULL;
281
282  do {
283    if(NULL == fgets(buf, sizeof(buf), fp))
284      break;
285    if(!retval) {
286      retval = strdup(buf);
287      if(!retval)
288        return NULL;
289    }
290    else {
291      char *ptr;
292      ptr = realloc(retval, strlen(retval) + strlen(buf) + 1);
293      if(!ptr) {
294        Curl_safefree(retval);
295        return NULL;
296      }
297      retval = ptr;
298      strcat(retval, buf);
299    }
300    nl = strchr(retval, '\n');
301  } while(!nl);
302
303  if(nl)
304    *nl = '\0';
305
306  return retval;
307}
308
309